#include <stdio.h>
#include "stdint.h"
#include "stdlib.h"

const uint8_t CRC8_ROHC_Table[256] = {
0x00,0x91,0xE3,0x72,0x07,0x96,0xE4,0x75,0x0E,0x9F,0xED,0x7C,0x09,0x98,0xEA,0x7B,
0x1C,0x8D,0xFF,0x6E,0x1B,0x8A,0xF8,0x69,0x12,0x83,0xF1,0x60,0x15,0x84,0xF6,0x67,
0x38,0xA9,0xDB,0x4A,0x3F,0xAE,0xDC,0x4D,0x36,0xA7,0xD5,0x44,0x31,0xA0,0xD2,0x43,
0x24,0xB5,0xC7,0x56,0x23,0xB2,0xC0,0x51,0x2A,0xBB,0xC9,0x58,0x2D,0xBC,0xCE,0x5F,
0x70,0xE1,0x93,0x02,0x77,0xE6,0x94,0x05,0x7E,0xEF,0x9D,0x0C,0x79,0xE8,0x9A,0x0B,
0x6C,0xFD,0x8F,0x1E,0x6B,0xFA,0x88,0x19,0x62,0xF3,0x81,0x10,0x65,0xF4,0x86,0x17,
0x48,0xD9,0xAB,0x3A,0x4F,0xDE,0xAC,0x3D,0x46,0xD7,0xA5,0x34,0x41,0xD0,0xA2,0x33,
0x54,0xC5,0xB7,0x26,0x53,0xC2,0xB0,0x21,0x5A,0xCB,0xB9,0x28,0x5D,0xCC,0xBE,0x2F,
0xE0,0x71,0x03,0x92,0xE7,0x76,0x04,0x95,0xEE,0x7F,0x0D,0x9C,0xE9,0x78,0x0A,0x9B,
0xFC,0x6D,0x1F,0x8E,0xFB,0x6A,0x18,0x89,0xF2,0x63,0x11,0x80,0xF5,0x64,0x16,0x87,
0xD8,0x49,0x3B,0xAA,0xDF,0x4E,0x3C,0xAD,0xD6,0x47,0x35,0xA4,0xD1,0x40,0x32,0xA3,
0xC4,0x55,0x27,0xB6,0xC3,0x52,0x20,0xB1,0xCA,0x5B,0x29,0xB8,0xCD,0x5C,0x2E,0xBF,
0x90,0x01,0x73,0xE2,0x97,0x06,0x74,0xE5,0x9E,0x0F,0x7D,0xEC,0x99,0x08,0x7A,0xEB,
0x8C,0x1D,0x6F,0xFE,0x8B,0x1A,0x68,0xF9,0x82,0x13,0x61,0xF0,0x85,0x14,0x66,0xF7,
0xA8,0x39,0x4B,0xDA,0xAF,0x3E,0x4C,0xDD,0xA6,0x37,0x45,0xD4,0xA1,0x30,0x42,0xD3,
0xB4,0x25,0x57,0xC6,0xB3,0x22,0x50,0xC1,0xBA,0x2B,0x59,0xC8,0xBD,0x2C,0x5E,0xCF,
};

typedef struct
{
    const uint8_t *pu8Table;	/**连接数据表*/
    uint8_t u8InitVal;			/**初始值*/
    uint8_t u8RefIn;			/**输入值反转, 0 false, 1 true*/
    uint8_t u8RefOut;			/**输出值反转, 0 false, 1 true*/
    uint8_t u8XorOut;			/**结果异或值*/
}SW_CRC8_st_t;

const SW_CRC8_st_t g_stSWCRC8_ROHC = 
{
    CRC8_ROHC_Table,    
    0xFFU,
    1,
    1,
    0x00U,
};


uint8_t SW_CRC8_Calculate(SW_CRC8_st_t stType, uint8_t u8Data[], uint32_t u32Len);
uint32_t reflected(uint32_t input, uint8_t bits);


int main()
{
	uint8_t ret;
	uint8_t data[8] = {0x20, 0x52, 0x69, 0x45, 0x61, 0x03, 0x17, 0x00};
   ret = SW_CRC8_Calculate( g_stSWCRC8_ROHC ,data , 8  );
   printf("%d \n",ret );
   
   return 0;
}

uint8_t SW_CRC8_Calculate(SW_CRC8_st_t stType, uint8_t u8Data[], uint32_t u32Len)
{
	uint8_t value = stType.u8InitVal;

	if (stType.u8RefIn)// 逆序 LSB 输入
	{
		value = reflected(stType.u8InitVal, 8U);
	}

	while (u32Len--)
	{
		value = stType.pu8Table[value ^ *u8Data++];
	}

	// 逆序输出
	if (stType.u8RefOut != stType.u8RefIn)
		value = reflected(value, 8U);

	// 异或输出
	value ^= stType.u8XorOut;

	return value;
}

uint32_t reflected(uint32_t input, uint8_t bits)
{
	uint32_t var = 0;
	while (bits--)
	{
		var <<= 1;
		if (input & 0x01)
			var |= 1;
		input >>= 1;
	}
	return var;
}